Heat controlling means for furnaces



Jan. 24, 1933. H. B. BROWN HEAT CONTROLLING MEANS FOR FURNACES Filed Feb. 1, 1932 w 0 r B attorney Patented Jan. 24;[l933 y Hoiian'r B.BRQW1\T, oF'oE nARrALI'is, IOWAJ- I nm rooNTRoLL'ING M ANsFon niinivaons f f i i Application filed February 1, 1932. Serial No. 590,146. j

My invention relates to heatcontrolling horizontallyand yet adjustab'lyuponthe'innieansfor furnaces, and the object of my imc-lnie'dwall 6- the following way-L v provement is'to supply for heating furnaces Secured to the incllned wall 6 as: by' screws of various descriptions having draft-doors ls'af centrally apertured bearing plate 2 lc'ov- V and dampers, coacting means for reversely ered by cOaCtT-ng:P1at'e225ew1edbyScrews 55 device including the compound helical spring opening and closing them simultaneously, 27 h r py co g h l whereof. such means being operatively controlled by constitute a spherical-bearing h l lI thermostatic means inserted in the furnaces Contained sP l l P r sleeve mwhere they are subjected to internal heat 1361 'w hllghtly coned ends 25'a'nd -26 '1and y th f y loosely mounted on; the shaft 11, By loosen- Another object is to furnish such means g S 'f WS h P ybe e y for mounting them adjustably upon a fur rotated? msfablyyto permit-ofposlt onmg mum V the shaft 11 1n a; horiz'o'ntal directfon', andthe J I have accomplished the above objects suc- Outer member ve s' mplllg means cessfully in actual reduction to practice, by l h P when ese v 27 g the devices which are hereinafter described n f locklt P e; f l tf thusbelflg and claimed, and which are illustrated in the mfjllnlialneds r o l" 0n y :5 accompanyin drawing, in wh ch Fig. 1 is a Chned Walls 6: of r f d I i side elevation'of a conventional hot air fur- Upon theshaft fl n i F 29 nace, having my improved thermostatic dea v fir d 'm f h wllfi f 1m? vice with draft door and damper operating 9 1 -T we connections and elements and according tov lnller termlnatlon of the P l 1 my invention. 'Fig. 2 is an enlarged side f l' amend f P siW 9 elevation in detail of my said thermostatic S secured y cross a 1 6151 f part 26 lias'a boss 29 with opposite parallel 75' faces, the'other-termination of'the spring being fastened upon one face thereof by a rivet28-.' Y

' Referring to Fig. a the'numeral 14GB- notes an arm fixed by a set-screw at 12 upon the outer end of the-shaft 1 1a-nd1h'as'a counterweight 18. The outer end of'the arm 'ltfi s forked at with its furcations' crossed by aipintl'e carrying a depending "block 17 and sheave 18. As shown'in Figs. land 4, a sheave 162's mounted rotatably on the shaft jl'lwithin a 'cavityof the arm 14. The arm A f q 1 G t 7 t1 "1 fl 2 14 has a longitudinal flange 1'9 with a I'on f lavfnb 6 rear 3 He g i tudinal row of holes The forward'd'eequlpped Wlth a hfnged d m and at pending end part ofthe cable 10 is secured 9 0 the front an ash-pit. door 4 having thereon in J said flangeadji-lstingly v asmaller draft door 5h1nged thereto. Upon permit adjustments f hr f thedmft arafter 7 overhead a pair of pulleys 8 and 9 d 5 I Fi 6 i ho ni MOSS se ti are mounted g y and carry the and wfthan enlarged scale the spring 28.

reach of a flexible cable 10, or chain if desired, lik i th p ing 32 OfFj 5; b i i- 5 one end of which is connected to the damper terinqi and united bars or plates-made of I 3. As usual the furnace casing has a conic metalshavingdifferentcoefiicients ofheatexrfrustum top 6 provi dedwith a lateral aperpansion and contraction", whichvary'the ac.- ture traversed by a rock-shaft 11. Referring tion off the spring in; rotating the shaft ll.

V to said'Figs. 1 and 2, this shaft is mounted The arm shown in. .ll,ig..;4, besidesthefad; 0

thereof as adjustably mounted upon a furnace casing. Fig. 3 is an outer front elevation thereofwith operating arm removed. Fig. 4 is a front elevation of said operating arm as mountedupon the outer end of the thermostat shaft. Fig.5 is a side elevation of the device, Without said arm, but including a sp ral spring of compound construction. Fig. 6 is a magnified cross section of either of said typesof springs as used in the invention. I V

The numeral 1 denotes a conventional justable connecting means for the cable 10, has thereon the sheave 18 and the other sheave 16 son the shaft 11 in cooperation for carrying the reach of another cable (or chain) as at 40 reeved about the sheaves and endconnected at its lower end to the draft door 5 on the ash-pit'doort. The upper termination of. the cable 40 is passed upWardlythrough an aperture in the floor above and suppliedwithan end ring 42 to be engaged with a wall pin above tofhold the draft door- I opens-by manual operation when desired,

This does not interfere with the automatic action of the devices previously described.

eluding a spring device of elements having different coefficients of expansion operating to rock the rock-shaft, a manually operable flex- HOBART B. BR WN.

The spring 28 is by the varying heat within the furnace casing, expanded or contracted to corres ondingly rotate the shaft 11 forward or bac and by way'of the cable 10 the draft door 5- ismore or less held open in its scope of movement, or held closed or entirely open,

the cable acting upon the draft door andf-the I damper 3reverselyinyopening and shutting V a V The modification of 25" them, and autom'atically.

substitution of a spiral spring 32 which, operates the shaft 11 similarly, but permr'ts the use of a, shorter shaft l1,,-so that thelatter maybe, installed within a furnace casing hav- 'ingqonlya smallfamount of clearance for the V va0 shaft. The spring 32 has its inner termi:

said shows'the 9 nation clampedwithin the split or forked ter- I mination of the shaft, and itslouter end 33 is bent outwardly and fastened to a lug34;

onthe sleeve bearing 35 by a screw 39, the

forks 531of the shaft being drawn together I byfa rivet 38 to clamp the inner inserted "end I ofthespring, Having described my invention, what I claim asl'new, and desire to secure byoLetters Patent, is: v r

-1.' In combination, a furnacehaving a draft door; and [a damper, a thermostatic device within the furnace consisting of a rock-shaft traversing the furnace wall outwardly and mounted thereon adj ustably, a sleeve around 7 In testimony whereof Iaflix'my si nature;

. said-shaft havinga segmentally spheric annulusaround it,-,a pa1rv ,of registering bearingele-mentswith spheric hollow to receive said spheric annulus, one of the elements being clampingly connected to the otl1erele ment toholds'aid'annulusand sleeve with said rock-shaft in adesire'd positionofadA 'justment' relative to thewall part of the fur- 'i'nace, casing upon which the bearing is mounted, and. opposite/connections between said 7 shaft and the-draft door anddamper to operate them reversely. 7 I

2'. In combination, a furnace having a draft door and a damper, a thermostatic de- 7 vice within'the furnace including a rock- I shaft'proj ecting without the furnace and havin'g'a crank-arm with alined sheaves" mounted Iongitudinal-alinement thereon, one.

sheave] being mounted coaxially with said r rock-shaft, saidthermostatic device also inv 

